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RTCA SC-135 and EUROCAE WG-14 Change Proposal Form (One major comment per form. Shaded blocks for committee use only.) SC-135 Paper Number: Date: DO-160E Section: Rev F #088E 1 March 06 16 Author’s Name, Affiliation, and E-mail: Paragraph: Page: Paul Schwerman, WG16, Honeywell. 16.7.2 [email protected] Reason for Change: Inrush currents need to be controlled in order to control the power quality in an aircraft. Note: The first millisecond usually consists of charging the EMI filter. Instead of ignoring the first millisecond, the test conditions are loosened to avoid making the test too onerous. SSPCs are driving the monitoring of the inrush current during the first millisecond. To make the inrush test repeatable and to not overly penalize for input capacitance in the EMI filter, the resistance between the power source and the EUT will be controlled. Proposal Disposition: Accepted As Written Withdrawn Accepted As Modified Rejected Other Rejection Reason: Proposal Deferred To: RTCA SC-135 Concurrence Proposal Disposition By: EUROCAE WG-14 Concurrence Date: Revise From: New paragraph Proposal Page Number: 1 of 4 SC-135 Change Proposal Form Rev C Revise To: 16.2 Inrush Current Control: Designation I: This designation is assigned to ac or dc equipment that meets the inrush current requirements specified for designation I. ---------------------------------------------------------------------------16.7.2 Inrush Current Requirements (ac and dc). 16.7.2.1 Definition The following requirements shall be met for equipment with designation I. Equipment that meets an alternate inrush test is to claim designation Z. Equipment that does not test inrush is to be marked with designation X. 16.7.2.2 Requirements When the nominal input voltage is abruptly applied, the peak inrush current shall be less than 10times maximum nominal load peak for the first 2.0 milliseconds, 4 times maximum nominal load peak up to 500 msec, and twice up to 2 seconds and nominal there after. The unloaded test is to provide 115 +/- 1V rms ac, 28.0 +/- 0.25 V dc or 270V +/- 2.7V. The loaded test is to provide 115 +/- 2V rms ac, 28.0 +/- 0.50 V dc or 270V +/- 5.4V at the power source's regulation point. The voltage rise time and fall time is to be less than 1/4 cycle for ac or less than 300 usec for dc. At the maximum load current draw, add a resistor between the power source and each EUT power input hot lead to adjust the measured voltage drop between the power source and EUT to the following: 3.0V +/- 0.3V rms ac for 115V ac equipment with power source set to 115V +/- 1V rms ac 1.0V +/- 0.1V dc for 28V dc equipment with power source set to 28V +/- 0.25V dc.. 9.0V +/- 0.9V for 270V dc equipment with power source set to 270V +/- 2.7V dc This voltage drop is to be measure within 7 inches of the regulation point of the power source and within 7 inches the EUTs input terminal. Test Condition 1: With the equipment stationary and unpowered for a minimum of 5 minutes, apply nominal input voltage and verify that the equipment meets the requirements of this section. Test Condition 2: With the equipment stabilized and in its maximum input current operating mode, reduce the input voltage to less than 5% of nominal for a period of 200 +20/-0 msec and then apply nominal input voltage and verify that the equipment meets the requirements of this section. Notes: 1. This test shall be performed with a frequency of: Proposal Page Number: 2 of 4 SC-135 Change Proposal Form Rev C 2. 400 +5/-0 Hz for A(CF) category equipment 360 +5/-0 Hz for variable frequency equipment then repeated with 650 +5/-0 Hz for A(NF) category equipment and 800 +5/-0 Hz for A(WF) category equipment. Abrupt application or removal of ac power occuring at the zero crossing of the ac voltage waveform is considered to meet the rise time requirements. As Modified Text: For reference: Klixon® 2TC Series breaker curves. The 20X number is being questions. 10X is preferred by Boeing. Box designers want a higher limit to cover noise at beginning. An example inrush current test with 0.14 ohm series impedance (instead of an allowed 0.67 ohms) between 28V source and EUT is shown below. The double leading edge spikes are cause by the contact bounce of the mechanical switch used to run the test. The light blue line is the voltage at the EUT terminals. The dark blue line is the current into the EUT. Proposal Page Number: 3 of 4 SC-135 Change Proposal Form Rev C Question: Add different letter for thermal vs Electronic CB curves? No, not at this time Kamiar/ Evelyn wish to add more stringent requirements for first 2 msec for loads over several kVA. Boeing and Airbus agree to allow 10X for smaller loads for first 2 msec. Mike Smith (SSPC manufacture) to look at this spec. Test method should be representative of aircraft regulating voltage at POR with line impedance to UUT. Note: 25 ohms (50 ohm in parallel with 50 ohms) and 1 uF gives a 6.37 kHz - 3dB point if we bandwidth limit the current probe. Airbus does not want to bandwidth limit the current probe. Jean-Paul needs the first msec to be controlled for SSPCs. Note: Mario suggests a different standardization of the inrush voltage drops similar to:. Test set is to deliver 10 cycle min at 10X nominal current with TBD +/- TBD voltage drop from nominal. Test set is to deliver 100 cycle min at 4X nominal current with TBD +/- TBD voltage drop from nominal. 0.5V drop for 14V Proposal Page Number: 4 of 4 SC-135 Change Proposal Form Rev C